I use this indoors at Batley, York, Cullingworth and Worksop on the low traction "gym floor with bits of carpet" tracks.

For adjustment, I'll move battery back or forward with the small foam either behind or in front. I'll also add or remove the 12g (6g+6g) rear bulkhead weight to suit, 12g for max traction, remove for more rotation. The key thing is shifting the weight bias of the car to the rear, from the standard YZ-2 setup thats more suited to higher traction.

I have run this back to back with the Ymax chassis, and this has equal traction with the car having better turn in and is more agile. The Ymax feels very sluggish/lazy in direction changes compared, I'm faster with this. Ymax drivers, please try it.